<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>This factory method creates a hash from a file</title>
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-base.css" />
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-medium.css" />

 </head>
 <body class="docs"><div class="navbar navbar-fixed-top">
  <div class="navbar-inner clearfix">
    <ul class="nav" style="width: 100%">
      <li style="float: left;"><a href="quickhashinthash.getsize.html">« QuickHashIntHash::getSize</a></li>
      <li style="float: right;"><a href="quickhashinthash.loadfromstring.html">QuickHashIntHash::loadFromString »</a></li>
    </ul>
  </div>
</div>
<div id="breadcrumbs" class="clearfix">
  <ul class="breadcrumbs-container">
    <li><a href="index.html">PHP Manual</a></li>
    <li><a href="class.quickhashinthash.html">QuickHashIntHash</a></li>
    <li>This factory method creates a hash from a file</li>
  </ul>
</div>
<div id="layout">
  <div id="layout-content"><div id="quickhashinthash.loadfromfile" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">QuickHashIntHash::loadFromFile</h1>
  <p class="verinfo">(PECL quickhash &gt;= Unknown)</p><p class="refpurpose"><span class="refname">QuickHashIntHash::loadFromFile</span> &mdash; <span class="dc-title">This factory method creates a hash from a file</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-quickhashinthash.loadfromfile-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="modifier">static</span> <span class="methodname"><strong>QuickHashIntHash::loadFromFile</strong></span>(<span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>, <span class="methodparam"><span class="type">int</span> <code class="parameter">$options</code><span class="initializer"> = ?</span></span>): <span class="type"><a href="class.quickhashinthash.html" class="type QuickHashIntHash">QuickHashIntHash</a></span></div>

  <p class="para rdfs-comment">
   This factory method creates a new hash from a definition file on disk. The
   file format consists of a signature <code class="literal">&#039;QH\0x11\0&#039;</code>, the number of elements as
   a 32 bit signed integer in system Endianness, followed by 32 bit signed
   integers packed together in the Endianness that the system that the code
   runs on uses. For each hash element there are two 32 bit signed integers
   stored. The first of each element is the key, and the second is the value
   belonging to the key. An example could be:
  </p>
  <p class="para">
   <div class="example" id="example-5111">
    <p><strong>示例 #1 QuickHash IntHash file format</strong></p>
    <div class="example-contents screen"><div class="cdata"><pre>00000000  51 48 11 00 02 00 00 00  01 00 00 00 01 00 00 00  |QH..............|
00000010  03 00 00 00 09 00 00 00                           |........|
00000018
</pre></div></div>
   </div>
  </p>
  <p class="para">
   <div class="example" id="example-5112">
    <p><strong>示例 #2 QuickHash IntHash file format</strong></p>
    <div class="example-contents screen"><div class="cdata"><pre>header signature (&#039;QH&#039;; key type: 1; value type: 1; filler: \0x00)
00000000  51 48 11 00

number of elements:
00000004  02 00 00 00

data string:
00000000  01 00 00 00 01 00 00 00  03 00 00 00 09 00 00 00

key/value 1 (key = 1, value = 1)
01 00 00 00  01 00 00 00

key/value 2 (key = 3, value = 9)
03 00 00 00  09 00 00 00
</pre></div></div>
   </div>
  </p>

 </div>


 <div class="refsect1 parameters" id="refsect1-quickhashinthash.loadfromfile-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">filename</code></dt>

     <dd>

      <p class="para">
       The filename of the file to read the hash from.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">options</code></dt>

     <dd>

      <p class="para">
       The same options that the class&#039; constructor takes; except that the size
       option is ignored. It is automatically calculated to be the same as the
       number of entries in the hash, rounded up to the nearest power of two
       with a maximum limit of <code class="literal">4194304</code>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-quickhashinthash.loadfromfile-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   Returns a new <span class="classname"><a href="class.quickhashinthash.html" class="classname">QuickHashIntHash</a></span>.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-quickhashinthash.loadfromfile-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5113">
    <p><strong>示例 #3 <span class="function"><strong>QuickHashIntHash::loadFromFile()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(&nbsp;</span><span style="color: #0000BB">__FILE__&nbsp;</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"/simple.hash"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$hash&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">QuickHashIntHash</span><span style="color: #007700">::</span><span style="color: #0000BB">loadFromFile</span><span style="color: #007700">(<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">QuickHashIntHash</span><span style="color: #007700">::</span><span style="color: #0000BB">DO_NOT_USE_ZEND_ALLOC<br /></span><span style="color: #007700">);<br />foreach(&nbsp;</span><span style="color: #0000BB">range</span><span style="color: #007700">(&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0x0f&nbsp;</span><span style="color: #007700">)&nbsp;as&nbsp;</span><span style="color: #0000BB">$key&nbsp;</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">printf</span><span style="color: #007700">(&nbsp;</span><span style="color: #DD0000">"Key&nbsp;%3d&nbsp;(%2x)&nbsp;is&nbsp;%s\n"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$key</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$key</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$hash</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">exists</span><span style="color: #007700">(&nbsp;</span><span style="color: #0000BB">$key&nbsp;</span><span style="color: #007700">)&nbsp;?&nbsp;</span><span style="color: #DD0000">'set'&nbsp;</span><span style="color: #007700">:&nbsp;</span><span style="color: #DD0000">'unset'<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
Key   0 ( 0) is unset
Key   1 ( 1) is set
Key   2 ( 2) is set
Key   3 ( 3) is set
Key   4 ( 4) is unset
Key   5 ( 5) is set
Key   6 ( 6) is unset
Key   7 ( 7) is set
Key   8 ( 8) is unset
Key   9 ( 9) is unset
Key  10 ( a) is unset
Key  11 ( b) is set
Key  12 ( c) is unset
Key  13 ( d) is set
Key  14 ( e) is unset
Key  15 ( f) is unset
</pre></div>
    </div>
   </div>
  </p>
 </div>



</div></div></div></body></html>